Precision Tool & Die Stamping
Progressive Stamping Die Scrap Strip Layout & Carrier DXF Prepress Guide
Master the CAD/CAM strip development, carrier ribbon geometry, pilot locating pin spacing, and scrap skeleton optimization for high-speed progressive stamping dies.
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1. Scrap Strip Progression Mechanics & Material Utilization
Progressive die stamping is the primary high-volume manufacturing method for precision metal stampings, electrical connectors, leadframes, automotive brackets, and micro-switch terminals. In progressive dies, a continuous coil strip is fed incrementally through a series of synchronized stations (notching, piercing, pilot locating, bending, embossing, and final cutoff).
Designing an optimal scrap strip layout requires balancing two competing engineering constraints:
- Material Utilization Efficiency (η): Calculated as
η = [A_part / (P · W_strip)] · 100%. Minimizing the bridge scrap web between parts and the carrier edge margins reduces raw coil cost. - Strip Rigidity & Feeding Reliability: The continuous scrap skeleton and carrier ribbon must retain sufficient structural stiffness under high acceleration (up to 800 strokes per minute) to prevent strip buckling, camber distortion, and feeder jam-ups.
2. Engineering Specifications & Tolerances
| Strip Material | Thickness (t) | Min Bridge Web (W_bridge) | Min Edge Margin (W_edge) | Pilot Diameter (D_pilot) |
|---|---|---|---|---|
| C11000 Copper / Brass C260 | 0.3 – 1.5 mm | 1.2 – 1.5 t (min 1.2 mm) | 1.5 – 1.8 t (min 1.5 mm) | 2.0 – 3.0 t |
| Phosphor Bronze C5191 (Terminals) | 0.15 – 0.8 mm | 1.0 – 1.2 t (min 0.8 mm) | 1.2 – 1.5 t (min 1.0 mm) | 2.5 – 3.5 t |
| Cold Rolled Steel (SPCC / 1008) | 0.8 – 3.0 mm | 1.2 – 1.5 t (min 1.5 mm) | 1.5 – 2.0 t (min 2.0 mm) | 1.8 – 2.5 t |
| 301 / 304 Stainless Steel Full Hard | 0.2 – 1.2 mm | 1.5 – 1.8 t (min 1.2 mm) | 1.8 – 2.2 t (min 1.8 mm) | 2.0 – 3.0 t |
| Al 5052-H32 / 6061-T6 | 0.8 – 2.5 mm | 1.3 – 1.6 t (min 1.5 mm) | 1.6 – 2.0 t (min 2.0 mm) | 2.0 – 2.8 t |
3. CAD/CAM DXF Strip Development & Station Sequencing Rules
- Pilot Pin Locating Stations: Pierce dedicated pilot locating holes in the first station and engage bullet-nosed pilot pins in every subsequent station to achieve strip indexing repeatability within ±0.005 mm.
- Carrier Ribbon Tab Geometry: Design single or dual side carrier ribbon tabs with flexible S-bend loops to allow local metal flow during progressive bending and drawing stations without distorting the feed pitch.
- Notch Punch Overcut Overlap: In notching station DXF contours, provide a
0.20 - 0.50 mmovercut overlap into adjacent scrap cutouts to eliminate feather edge burrs and sliver pinch points. - Station Tonnage Balancing: Distribute piercing, embossing, and forming stations symmetrically around the press ram center of tonnage to prevent angular deflection and uneven die wear.
- 100% Closed Vector Contours: Ensure all station punch cutouts, carrier ribbons, and stripper window DXFs consist of continuous closed polylines with zero intersecting nodes.
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